APA (7th ed.) Citation

Ries, H. (1947). Economic geology (7. ed.). Wiley [u.a.].

Chicago Style (17th ed.) Citation

Ries, Heinrich. Economic Geology. 7. ed. New York: Wiley [u.a.], 1947.

MLA (9th ed.) Citation

Ries, Heinrich. Economic Geology. 7. ed. Wiley [u.a.], 1947.